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【单选题】
According to airline industry statistics, almost 90% of airline accidents are not survivable or partially survivable. But passengers can increase their chances of survival by learning and following certain tips. Experts say that you should read and listen to safety instructions before takeoff and ask question if you have uncertainties. You should fasten your seat belt low on your hips and as possible. Of course, you should also know how the release mechanism of your belt operates. During takeoffs and landings you are advised to keep your feet flat on the floor. Before takeoff you should locate the nearest exit and an alternative exit and count the rows of seats between you and the exits so that you can find them in the dark if necessary. In the event that you are forewarned of a possible accident, you should put your hands on your ankles and keep your head down until the plane comes to a complete stop. If smoke is present in the cabin, you should keep your head low and cover your face with napkins, towels, or clothing. If possible, wet these for added protection against smoke inhalation. To evacuate as quickly as possible, follow crew commands and do not take personal belongings with you. Do not jump on escape slides before they are fully inflated, and when you jump, do so with your arms and legs extended in front of you. When you get to the ground, you should move away from the plane as quickly as possible, and never smoke near the wreckage. According to the experts, when should travelers read and listen to safety instructions?
A.
Before takeoff.
B.
In an emergency.
C.
Throughout the flight.
D.
During landings.
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参考答案:
举一反三
【单选题】不属于呼吸道病原的是
A.
脑膜炎奈瑟菌
B.
麻疹病毒
C.
水痘病毒
D.
轮状病毒
E.
流感病毒
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肺炎链球菌
B.
结核分枝杆菌
C.
卡他莫拉菌
D.
流感嗜血杆菌
E.
变形杆菌
【判断题】每一个 Android 应用程序中都必须有 AndroidManifest.xml 文件。
A.
正确
B.
错误
【判断题】每一个 Android 应用程序中都必须有 Activity 。
A.
正确
B.
错误
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A.
父母家长
B.
社区环境
C.
家庭环境
【单选题】中等负荷的过量空气系数一般为:
A.
0.6-0.8
B.
0.7-0.9
C.
0.9-1.1
D.
0.4-0.6
【简答题】置换型固溶体若发生不等价取代,为了保持结构的电中性,必然会在晶体中产生 ,即在原来结构的结点位置上产生空位或嵌入新质点,这种缺陷的浓度取决于 和 。
【单选题】固溶体保持了( )的晶体结构。
A.
溶剂
B.
溶质
【单选题】“孟母三迁”的故事说明,()因素对幼儿社会性发展的影响。
A.
父母家长
B.
社区环境
C.
家庭环境
D.
媒体环境
【判断题】“ 孟母三迁 ” 的故事说明社区环境因素对幼儿社会性发展的影响。
A.
正确
B.
错误
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